I need help. I have a 2004 tahoe lt 4x4. I was driving down the road tonight going 55 and I go down a incline and back up and I hear a pop sound and now my tahoe will not pull in any position not even reverse and also after pulling over with the motor still running I could hear a loud whinning sound. Please tell me the answer to this and it is not I am needing a transmission. This is my only vehicle so a quick response will be awesome. Thank everyone I am new to these things so I hope I did this right and can get some help.